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CATHAICA 2(5): 55–62

Unionetta xishuangbannaensis n. sp. is the only representative of Parreysiinae Henderson, 1935 (Bivalvia: Unionidae) in China: evidence from molecular phylogeny and morphology

版纳小珠蚌是雕刻蚌亚科（双壳纲：蚌科）在中国的唯一代表：基于分子系统发育与形态学的证据

Zhong-Guang Chen (陈重光)1,3,#,*, Yu-Ting Dai (代雨婷)2,#, Hui Zheng (郑辉)1,4, & Shan Ouyang (欧阳珊)1,5 & Xiao-Ping Wu (吴小平)1,6,*

1 School of Life Sciences, Nanchang University, Nanchang, Jiangxi 330031, China.

[南昌大学生命科学学院 南昌 330031 中国]

2 College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang, Jiangxi 330045, China;

[江西农业大学动物科学技术学院 南昌 330045 中国]

https://orcid.org/0009-0001-5856-3987

3 https://orcid.org/0000-0003-2689-3321; Email: zgchen1002@foxmail.com

4 https://orcid.org/0009-0004-5222-3975

5 https://orcid.org/0009-0004-6973-4800

6 https://orcid.org/0000-0002-8037-5640; Email: xpwu@ncu.edu.cn

（*通讯作者; #共同第一作者）

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Abstract

A new species of freshwater mussel, Unionetta xishuangbannaensis n. sp., is described from a tributary of the Lancangjiang River (Mekong) basin in Yunnan, China. It can be distinguished from congener by an irregularly elongated triangle shell with an elongated, narrow and relatively pointed posterior, a weak ridge near the posterior dorsal margin, and a smooth transition between dorsal and posterior margins. The validity of the new species is further supported by the molecular phylogenetic results based on COI sequences. Molecular phylogenetic results reveal that the genera of Indochinellini are generally non-monophyletic and await a comprehensive systematic revision.

Key words: Freshwater biodiversity, molluscs, new species, phylogeny, taxonomy

摘 要

本文描述了产自云南澜沧江流域的河蚌新种：版纳小珠蚌 Unionetta xishuangbannaensis n. sp.。该种可依据以下特征与同属其他种区分：贝壳延长，不规则的三角形，具延长、狭窄且相对较尖的后部，背缘后部具一弱脊，且背缘与后缘平滑过渡。其有效性也被基于COI序列的分子系统发育结果所证实。分子系统发育结果表明，印支蚌族各属普遍非单系群，有待开展全面的系统修订。

关键词：水生生物多样性，软体动物，新物种，系统发育，分类学